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mysql_fetch_row_nonblocking() is an asynchronous function. It is the counterpart of themysql_fetch_row() synchronous function, for use by applications that require asynchronous communication with the server. For general information about writing asynchronous C API applications, seeChapter 7,C API Asynchronous Interface.

• mysql_fetch_row() returns aMYSQL_ROW value containing the next row, orNULL. The meaning of aNULL return depends on which function was called precedingmysql_fetch_row():

  • When used aftermysql_store_result() ormysql_store_result_nonblocking(),mysql_fetch_row() returnsNULL if there are no more rows to retrieve.

  • When used aftermysql_use_result(),mysql_fetch_row() returnsNULL if there are no more rows to retrieve or an error occurred.

• mysql_fetch_row_nonblocking() returns anenum net_async_status status indicator and takes a secondrow argument that provides a pointer to aMYSQL_ROW value. When the return status isNET_ASYNC_COMPLETE, therow argument is a pointer to aMYSQL_ROW value containing the next row, orNULL. The meaning ofNULL depends on which function was called precedingmysql_fetch_row_nonblocking():

  • When used aftermysql_store_result() ormysql_store_result_nonblocking(), therow argument isNULL if there are no more rows to retrieve.

  • When used aftermysql_use_result(), therow argument isNULL if there are no more rows to retrieve or an error occurred.